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In 1844, Charles Goodyear obtained the first patent for a rubber condom.

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The top five reasons that children stay home from school are as follows: colds, stomach flu (gastroenteritis), ear infection (otitis media), pink eye (conjunctivitis), and sore throat.

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According to research, pregnant women tend to eat more if carrying a baby boy. Male fetuses may secrete a chemical that stimulates their mothers to step up her energy intake.

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The strongest synthetic topical retinoid drug available, tazarotene, is used to treat sun-damaged skin, acne, and psoriasis.

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Blood in the urine can be a sign of a kidney stone, glomerulonephritis, or other kidney problems.

Large numbers of plant species can flower at once in this grassland in Kinsella, Alberta. Large numbers of plant species can flower at once in this grassland in Kinsella, Alberta.
Speckled wood aegeria sub-species, Algendar gorge, Minorca Speckled wood aegeria sub-species, Algendar gorge, Minorca
The difference between a human and an ape. The difference between a human and an ape.
Some of the major nerves of the human nervous system Some of the major nerves of the human nervous system
Australia's spiny anteater, one of only three modern species of monotremes Australia's spiny anteater, one of only three modern species of monotremes
Cladogram showing genetic distances and relationships between human populations Cladogram showing genetic distances and relationships between human populations
Video: Monohybrid crosses

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